text: def from_file_msmpk(item, molecular_system=None, atom_indices='all', frame_indices='all'):
  
      from molsysmt.forms.api_file_msmpk import to_molsysmt_MolSys as file_msmpk_to_molsysmt_MolSys
      from molsysmt.forms.api_molsysmt_MolSys import to_molsysmt_Trajectory as molsysmt_MolSys_to_molsysmt_Trajectory
  
      tmp_item, tmp_molecular_system = file_msmpk_to_molsysmt_MolSys(item,
              molecular_system=molecular_system, atom_indices=atom_indices,
              frame_indices=frame_indices)
  
      tmp_item, tmp_molecular_system = molsysmt_MolSys_to_molsysmt_Trajectory(tmp_item,
              molecular_system=tmp_molecular_system)
  
      return tmp_item, tmp_molecular_system
  
  